為了提高直接轉(zhuǎn)矩控制（DTC）系統(tǒng)定子磁鏈估計精度，降低電流、電壓測量的隨機誤差，提出了一種基于擴展卡爾曼濾波（EKF）實現(xiàn)異步電機轉(zhuǎn)子位置和速度估計的方法。擴展卡爾曼濾波器是建立在基于旋轉(zhuǎn)坐標系下由定子電流、電壓、轉(zhuǎn)子轉(zhuǎn)速和其它電機參量所構(gòu)成的電機模型上，將定子電流、定子磁鏈、轉(zhuǎn)速和轉(zhuǎn)子角位置作為狀態(tài)變量，定子電壓為輸入變量，定子電流為輸出變量，通過對磁鏈和轉(zhuǎn)速的閉環(huán)控制提高定子磁鏈的估計精度，實現(xiàn)了異步電機的無速度傳感器直接轉(zhuǎn)矩控制策略，仿真結(jié)果驗證了該方法的可行性,提高了直接轉(zhuǎn)矩的控制性能。
Abstract:
In order to improve the Direct Torque Control（DTC） system of stator flux estimation accuracy and reduce the current， voltage measurement of random error， a novel method to estimate the speed and rotor position of asynchronous motor based on extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters （state vector: stator current， stator flux linkage， rotor angular speed and position； input: stator voltage； output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
12864液晶時鐘顯示程序
LCD 地址變量
;**************變量的定義*****************
RS BIT P2.0 ;LCD數(shù)據(jù)/命令選擇端(H/L)
RW BIT P2.1 ;LCD讀/寫選擇端(H/L)
EP BIT P2.2 ;LCD使能控制
PSB EQU P2.3
RST EQU P2.5
PRE BIT P1.4 ;調(diào)整鍵(K1)
ADJ BIT P1.5 ;調(diào)整鍵(K2)
COMDAT EQU P0
LED EQU P0.3
YEAR DATA 18H ;年,月,日變量
MONTH DATA 19H
DATE DATA 1AH
WEEK DATA 1BH
HOUR DATA 1CH ;時,分,秒,百分之一秒變量
MIN DATA 1DH
SEC DATA 1EH
SEC100 DATA 1FH
STATE DATA 23H
LEAP BIT STATE.1 ;是否閏年標志1--閏年，0--平年
KEY_S DATA 24H ;當前掃描鍵值
KEY_V DATA 25H ;上次掃描鍵值
DIS_BUF_U0 DATA 26H ;LCD第一排顯示緩沖區(qū)
DIS_BUF_U1 DATA 27H
DIS_BUF_U2 DATA 28H
DIS_BUF_U3 DATA 29H
DIS_BUF_U4 DATA 2AH
DIS_BUF_U5 DATA 2BH
DIS_BUF_U6 DATA 2CH
DIS_BUF_U7 DATA 2DH
DIS_BUF_U8 DATA 2EH
DIS_BUF_U9 DATA 2FH
DIS_BUF_U10 DATA 30H
DIS_BUF_U11 DATA 31H
DIS_BUF_U12 DATA 32H
DIS_BUF_U13 DATA 33H
DIS_BUF_U14 DATA 34H
DIS_BUF_U15 DATA 35H
DIS_BUF_L0 DATA 36H ;LCD第三排顯示緩沖區(qū)
DIS_BUF_L1 DATA 37H
DIS_BUF_L2 DATA 38H
DIS_BUF_L3 DATA 39H
DIS_BUF_L4 DATA 3AH
DIS_BUF_L5 DATA 3BH
DIS_BUF_L6 DATA 3CH
DIS_BUF_L7 DATA 3DH
DIS_BUF_L8 DATA 3EH
DIS_BUF_L9 DATA 3FH
DIS_BUF_L10 DATA 40H
DIS_BUF_L11 DATA 41H
DIS_BUF_L12 DATA 42H
DIS_BUF_L13 DATA 43H
DIS_BUF_L14 DATA 44H
DIS_BUF_L15 DATA 45H
FLAG DATA 46H ;1-年，2-月，3-日，4-時，5-分，6-秒，7-退出調(diào)整。
DIS_H DATA 47H
DIS_M DATA 48H
DIS_S DATA 49H
Explain how to open the Waveform Viewer for Verification
? State how to insert nodes into the Waveform Viewer
? Tell how to assign Stimulus with the Stimulator Selector
介紹幾種cpuThe 8xC251SA/SB/SP/SQ improves on the MCS-51 architecture and peripheral features, introducing the advanced register based CPU architecture i.e., the MCS 251 microcontroller architecture. The register based CPU supports a 40-byte register file. In addition, the 8xC251SA/SB/SP/SQ microcontroller has 256-Kbyte expanded external code/data memory space and 64-Kbyte stack space. The new controller is also specially designed to execute C code efficiently. More importantly, the 8xC251SA/SB/SP/SQ maintains binary code compatibility with MCS 51 microcontrollers but at the same time allows the use of the powerful MCS 251 microcontroller instruction set, with many new 8, 16 and 32 bit instructions available. The 8xC251SA/SB/SP/SQ has 512 bytes or 1 Kbyte of on-chip data RAM options and is available in 16 Kbytes and 8 Kbytes of on-chip ROM/OTPROM or ROMless options.
WHAT MIME64 IS: MIME64 is an encoding described in RFC1341 as MIME base64.Its purpose is to encode binary files into ASCII so that they may be passedthrough e-mail gates. In this regard, MIME64 is similar to UUENCODE.Although most binaries these days are transmitted using UUENCODE, Ihave seen a few using MIME64, and I have had requests from friends thatI decode MIME64 files that have fallen into their hands. As long assome MIME64 continues to exist, a package such as this one is usefulto have.
This scheme is initiated by Ziv and Lempel [1]. A slightly modified version is described by Storer and Szymanski [2]. An implementation using a binary tree is proposed by Bell [3]. The algorithm is quite simple: Keep a ring buffer, which initially contains "space" characters only. Read several letters from the file to the buffer. Then search the buffer for the longest string that matches the letters just read, and send its length and position in the buffer.
The Kannel Open Source WAP and SMS gateway works as both an SMS gateway, for implementing keyword based services via GSM text messages, and a WAP gateway, via UDP. The SMS part is fairly mature, the WAP part is early in its development. In this release, the GET request for WML pages and WMLScript files via HTTP works, including compilation for WML and WMLScript to binary forms. Only the data call bearer (UDP) is supported, not SMS.
